Round Corners of resizable view - ios

Question

Ive been using the code shown below to round selected corners of views, however am now having trouble achieving this on a resizable view as the layer? isn't updated each time the view is resized.
extension UIView {
func roundCorners(corners:UIRectCorner, radius: CGFloat) {
let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
let mask = CAShapeLayer()
mask.path = path.cgPath
self.layer.mask = mask
}
}
titleLabelView.roundCorners(corners: [.topLeft, .topRight], radius: 10)
There is a similar question here but its quite old and all done in objC.
Is there a way of rounding selected corners in swift for resizable views?
----- EDIT -----
So essentially what i have is a text table that i have set to resize based on the size of the text.
In most cases i can just use:
myTextLabel.layer.cornerRadius = 10
However this does all 4 corners. So if i want to round just the top 2 then i need to use the extension above. Now because i am using scrollViewDidEndDecelerating to set the content for the label (i need to get the indexPath for the cell at the centre of the collectionView so i can set the text label)
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
GeneralFunctions.getIndexOfCell(sender: self) { (index) in
self.titleLabel.text = self.partArray[index].title
self.titleLabel.roundCorners(corners: [.topLeft, .topRight], radius: 10)
self.descriptionLabel.text = self.partArray[index].description
self.descriptionLabel.roundCorners(corners: [.bottomLeft, .bottomRight], radius: 10)
self.backgroundLabelView.layer.cornerRadius = 16
self.backgroundLabelView.layoutIfNeeded()
self.backgroundLabelView.layoutSubviews()
}
}
Using viewDidLayoutSubViews doesn't work in this case as there is a lag between accelerating ending and the layout. I have tried using the same code(without the check for the centre index) inside viewDidLayoutSubViews but the result is the same.
And The label does resize correctly when i don't use any of the corner rounding.

Answer 1

I had similar problem, I've solved it by using this function like
DispatchQueue.main.async(execute: {
self.roundCorners(.allCorners, radius: 6, borderColor: nil, borderWidth: nil)
})
I am using this function a lot for UITableViewCell, and my whole code looks like
private var didLayoutSubview = false {
didSet {
DispatchQueue.main.async(execute: {
self.roundCorners(.allCorners, radius: 6, borderColor: nil, borderWidth: nil)
})
}
}
override func layoutSubviews() {
if !self.didLayoutSubview {
self.didLayoutSubview = true
}
super.layoutSubviews()
}
So basically, calling this function in main thread helped, and I am calling it inside layoutSubivews because I think it is the place.
My function
func roundCorners(_ corners: UIRectCorner, radius: CGFloat, borderColor: UIColor?, borderWidth: CGFloat?) {
let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
let mask = CAShapeLayer()
mask.frame = self.bounds
mask.path = path.cgPath
self.layer.mask = mask
if borderWidth != nil {
addBorder(mask, borderWidth: borderWidth!, borderColor: borderColor!)
}
}